Subtract 4.66 x 10^-5 - 7.34 x10^-7
2.68 x 10^2
4.5866 x 10^-5
-2.68 x 10^2
-4.5866 x 10^-5
The correct answer is 4.5866 x 10^-5.
The US national debt was $2.9617 x 10^13 in 2021 and $3.98 x 10^11 in 1971. Find how much the debt increased in the 50-year period.
$2.9219 x 10^11
$1.0183 x 10^24
$3.0015 x 10^13
$2.9219 x 10^13
To find how much the debt increased in the 50-year period, we subtract the 1971 debt from the 2021 debt:
($2.9617 x 10^13) - ($3.98 x 10^11) = $2.9219 x 10^13
Therefore, the debt increased by $2.9219 x 10^13. The correct answer is $2.9219 x 10^13.
The size of a hydrogen atom is about 1.2 x 10^-10 m across. The size of an oxygen atom is 0.000000000152 m across. What is the difference between the sizes of these atoms in scientific notation?
3.2 x 10^-11 m
2.72 x 10^-10 m
3.2 x 10^-10 m
3.2 x 10^-9 m
To find the difference between the sizes of the atoms, we subtract the size of the hydrogen atom from the size of the oxygen atom:
(0.000000000152 m) - (1.2 x 10^-10 m) = 3.2 x 10^-11 m
Therefore, the difference between the sizes of the atoms is 3.2 x 10^-11 m. The correct answer is 3.2 x 10^-11 m.
Platelets and red blood cells are components of the blood. A typical platelet and red blood cell have diameters of approximately 2.33 x 10^-6 m and 0.0000075 m, respectively. Which blood component has a bigger diameter, and approximately by how much?
A red blood cell has a bigger diameter than a platelet by 5.17 x 10^-6 m.
A platelet has a bigger diameter than a red blood cell by 5.17 x 10^-6 m.
A platelet has a bigger diameter than a red blood cell by 9.83 x 10^-6 m.
A red blood cell has a bigger diameter than a platelet by 9.83 x 10^-6 m.
To determine which blood component has a bigger diameter and approximate the difference, we subtract the diameter of the platelet from the diameter of the red blood cell:
(0.0000075 m) - (2.33 x 10^-6 m) = 5.17 x 10^-6 m
Therefore, a red blood cell has a bigger diameter than a platelet by 5.17 x 10^-6 m. The correct answer is "A red blood cell has a bigger diameter than a platelet by 5.17 x 10^-6 m."
China and India are the most populous countries in the world. China's population is approximately 1.45 x 10^9, while India's population is approximately 1,400,000,000. How many more people live in China than in India?
5 x 10^10
5 x 10^9
5 x 10^7
5 x 10^8
To find the difference in population between China and India, we subtract the population of India from the population of China:
(1.45 x 10^9) - 1,400,000,000 = 5 x 10^7
Therefore, there are 5 x 10^7 more people living in China than in India. The correct answer is "5 x 10^7."